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depth-0" style="padding-top:;"><!----> <p class="sidebar-heading"><span>试试 Cycle.js</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0" style="padding-top:10px;"><div class="kitty-main" data-v-2b653b36><span class="stand" data-v-2b653b36></span> <div class="cat" data-v-2b653b36><div class="body" data-v-2b653b36></div> <div class="head" data-v-2b653b36><div class="ear" data-v-2b653b36></div> <div class="ear" data-v-2b653b36></div></div> <div class="face" data-v-2b653b36><div class="nose" data-v-2b653b36></div> <div class="whisker-container" data-v-2b653b36><div class="whisker" data-v-2b653b36></div> <div class="whisker" data-v-2b653b36></div></div> <div class="whisker-container" data-v-2b653b36><div class="whisker" data-v-2b653b36></div> <div class="whisker" data-v-2b653b36></div></div></div> <div class="tail-container" data-v-2b653b36><div class="tail" data-v-2b653b36><div class="tail" data-v-2b653b36><div 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href="/front-end-playground/front-end-others/d3-tree/6-add-smart-menu.html" class="sidebar-link">6. 添加右键菜单</a></li><li><a href="/front-end-playground/front-end-others/d3-tree/7-text-path.html" aria-current="page" class="active sidebar-link">7. 曲线上的文字 textPath</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/front-end-playground/front-end-others/d3-tree/7-text-path.html#textpath" class="sidebar-link">textPath</a></li><li class="sidebar-sub-header"><a href="/front-end-playground/front-end-others/d3-tree/7-text-path.html#添加-textpath" class="sidebar-link">添加 textPath</a></li><li class="sidebar-sub-header"><a href="/front-end-playground/front-end-others/d3-tree/7-text-path.html#path-方向调整" class="sidebar-link">path 方向调整</a></li></ul></li><li><a href="/front-end-playground/front-end-others/d3-tree/8-add-path-click.html" class="sidebar-link">8. 曲线 hover 和点击</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0" style="padding-top:;"><!----> <p class="sidebar-heading"><span>试试 Three.js</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0" style="padding-top:;"><!----> <p class="sidebar-heading"><span>BOX2D.js 文档与教程</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><p>因为业务需要折腾起了图表，该系列用于记录使用该库制作 Tree 图表的一些笔记。本节我们要在 link 连接线上，添加文字说明。</p> <h1 id="添加曲线文字"><a href="#添加曲线文字" class="header-anchor">#</a> 添加曲线文字</h1> <hr> <h2 id="textpath"><a href="#textpath" class="header-anchor">#</a> textPath</h2> <p>除了笔直地绘制一行文字以外， SVG 也可以根据 <code>&lt;path&gt;</code> 元素的形状来放置文字。 只要在<code>&lt;textPath&gt;</code>元素内部放置文本，并通过其<code>xlink:href</code>属性值引用<code>&lt;path&gt;</code>元素，我们就可以让文字块呈现在<code>&lt;path&gt;</code>元素给定的路径上了。</p> <h2 id="添加-textpath"><a href="#添加-textpath" class="header-anchor">#</a> 添加 textPath</h2> <p>简单来说，我们想要实现连接线上增加文字说明，需要进行这样的处理：</p> <ol><li>给每个 link 的 svg 元素<code>&lt;path&gt;</code>添加 id 标识。</li> <li>在 link 的 enter 操作中，添加<code>&lt;textPath&gt;</code>元素，并设置<code>xlink:href</code>属性值引用对应的<code>&lt;path&gt;</code>。</li> <li>给每个<code>&lt;textPath&gt;</code>添加对应的文字和颜色。</li></ol> <h3 id="给-path-添加-id-标识"><a href="#给-path-添加-id-标识" class="header-anchor">#</a> 给 path 添加 id 标识</h3> <p>在 link 的 enter 操作中，给<code>&lt;path&gt;</code>添加 id：</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token comment">// 添加enter操作，添加类名为link的path元素</span>
<span class="token keyword">var</span> linkEnter <span class="token operator">=</span> link
  <span class="token punctuation">.</span><span class="token function">enter</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
  <span class="token punctuation">.</span><span class="token function">insert</span><span class="token punctuation">(</span><span class="token string">&quot;path&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;g&quot;</span><span class="token punctuation">)</span>
  <span class="token punctuation">.</span><span class="token function">attr</span><span class="token punctuation">(</span><span class="token string">&quot;class&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;link&quot;</span><span class="token punctuation">)</span>
  <span class="token comment">// 添加id</span>
  <span class="token punctuation">.</span><span class="token function">attr</span><span class="token punctuation">(</span><span class="token string">&quot;id&quot;</span><span class="token punctuation">,</span> <span class="token parameter">d</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token string">&quot;textPath&quot;</span> <span class="token operator">+</span> d<span class="token punctuation">.</span>id<span class="token punctuation">;</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// ...其他操作</span>
</code></pre></div><h3 id="添加-textpath-文字"><a href="#添加-textpath-文字" class="header-anchor">#</a> 添加 textPath 文字</h3> <p>我们在 link 的 enter 操作中，添加 text，同时添加与 path 匹配的 textPath：</p> <div class="language-js extra-class"><pre class="language-js"><code>link
  <span class="token punctuation">.</span><span class="token function">enter</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
  <span class="token punctuation">.</span><span class="token function">append</span><span class="token punctuation">(</span><span class="token string">&quot;text&quot;</span><span class="token punctuation">)</span>
  <span class="token comment">// 给text添加textPath元素</span>
  <span class="token punctuation">.</span><span class="token function">append</span><span class="token punctuation">(</span><span class="token string">&quot;textPath&quot;</span><span class="token punctuation">)</span>
  <span class="token comment">// 给textPath设置path的引用</span>
  <span class="token punctuation">.</span><span class="token function">attr</span><span class="token punctuation">(</span><span class="token string">&quot;xlink:href&quot;</span><span class="token punctuation">,</span> <span class="token parameter">d</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token string">&quot;#textPath&quot;</span> <span class="token operator">+</span> d<span class="token punctuation">.</span>id<span class="token punctuation">;</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token comment">// 字体居中</span>
  <span class="token punctuation">.</span><span class="token function">style</span><span class="token punctuation">(</span><span class="token string">&quot;text-anchor&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;middle&quot;</span><span class="token punctuation">)</span>
  <span class="token punctuation">.</span><span class="token function">attr</span><span class="token punctuation">(</span><span class="token string">&quot;startOffset&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;50%&quot;</span><span class="token punctuation">)</span>
  <span class="token comment">// 父节点的name</span>
  <span class="token punctuation">.</span><span class="token function">style</span><span class="token punctuation">(</span><span class="token string">&quot;fill&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;red&quot;</span><span class="token punctuation">)</span>
  <span class="token punctuation">.</span><span class="token function">text</span><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">d</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> d<span class="token punctuation">.</span>parent<span class="token punctuation">.</span>id<span class="token punctuation">;</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">.</span><span class="token function">append</span><span class="token punctuation">(</span><span class="token string">&quot;tspan&quot;</span><span class="token punctuation">)</span>
  <span class="token punctuation">.</span><span class="token function">style</span><span class="token punctuation">(</span><span class="token string">&quot;fill&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;blue&quot;</span><span class="token punctuation">)</span>
  <span class="token punctuation">.</span><span class="token function">text</span><span class="token punctuation">(</span><span class="token string">&quot; --&gt; &quot;</span><span class="token punctuation">)</span>
  <span class="token comment">// 子节点的name</span>
  <span class="token punctuation">.</span><span class="token function">append</span><span class="token punctuation">(</span><span class="token string">&quot;tspan&quot;</span><span class="token punctuation">)</span>
  <span class="token punctuation">.</span><span class="token function">style</span><span class="token punctuation">(</span><span class="token string">&quot;fill&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;red&quot;</span><span class="token punctuation">)</span>
  <span class="token punctuation">.</span><span class="token function">text</span><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">d</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> d<span class="token punctuation">.</span>id<span class="token punctuation">;</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><p>上面我们还处理了这样的事情，添加文字说明：父节点 id --&gt; 子节点 id，同时还设置了颜色。</p> <h2 id="path-方向调整"><a href="#path-方向调整" class="header-anchor">#</a> path 方向调整</h2> <p>如果按照这样的方式，我们会发现我们的文字反了：
<img src="https://github-imglib-1255459943.cos.ap-chengdu.myqcloud.com/1513586990%281%29.png" alt="image"></p> <p>像一个个蝙蝠，倒挂着在那。这是因为 pathText 是有方向的，而我们在添加 path 元素的时候，使用的贝塞尔曲线为子节点到父节点的方向，故我们需要进行调整：</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token comment">// 添加贝塞尔曲线的path，方向为父节点指向子节点</span>
<span class="token keyword">function</span> <span class="token function">diagonalReverse</span><span class="token punctuation">(</span><span class="token parameter">s <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span> d <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token punctuation">}</span></span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  path <span class="token operator">=</span> <span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">M </span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>d<span class="token punctuation">.</span>y<span class="token interpolation-punctuation punctuation">}</span></span><span class="token string"> </span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>d<span class="token punctuation">.</span>x<span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">
                  C </span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span><span class="token punctuation">(</span>s<span class="token punctuation">.</span>y <span class="token operator">+</span> d<span class="token punctuation">.</span>y<span class="token punctuation">)</span> <span class="token operator">/</span> <span class="token number">2</span><span class="token interpolation-punctuation punctuation">}</span></span><span class="token string"> </span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>d<span class="token punctuation">.</span>x<span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">,
                  </span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span><span class="token punctuation">(</span>s<span class="token punctuation">.</span>y <span class="token operator">+</span> d<span class="token punctuation">.</span>y<span class="token punctuation">)</span> <span class="token operator">/</span> <span class="token number">2</span><span class="token interpolation-punctuation punctuation">}</span></span><span class="token string"> </span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>s<span class="token punctuation">.</span>x<span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">,
                  </span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>s<span class="token punctuation">.</span>y<span class="token interpolation-punctuation punctuation">}</span></span><span class="token string"> </span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>s<span class="token punctuation">.</span>x<span class="token interpolation-punctuation punctuation">}</span></span><span class="token template-punctuation string">`</span></span><span class="token punctuation">;</span>
  <span class="token keyword">return</span> path<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><p>然后把之前<code>diagonal</code>改为<code>diagonalReverse</code>，就可以实现想要的效果了。</p> <p>最终效果如图：
<img src="https://github-imglib-1255459943.cos.ap-chengdu.myqcloud.com/1513586680%281%29.png" alt="image"></p> <h1 id="结束语"><a href="#结束语" class="header-anchor">#</a> 结束语</h1> <p>本节介绍了一个新的 svg 元素--textPath，可以通过绘制 path，然后给 text 添加 textPath 来绘制曲线文字。刚开始本骚年还以为是 d3 的能力，看来是小瞧了 svg 了呢，不过现在似乎 svg 使用越来越少了呢。Sign~</p> <p><a href="https://github.com/godbasin/godbasin.github.io/tree/blog-codes/d3-tree-notes/7-text-path" target="_blank" rel="noopener noreferrer">此处查看项目代码<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a><br> <a href="http://d3.godbasin.com/7-text-path/index.html" target="_blank" rel="noopener noreferrer">此处查看页面效果<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></p></div> <!----> <footer class="page-edit"><div class="edit-link"><a href="https://github.com/godbasin/front-end-playground/edit/sourcecode/docs/front-end-others/d3-tree/7-text-path.md" target="_blank" rel="noopener noreferrer">帮阿猪改善此页面！</a> <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></div> <!----> <blockquote>部分文章中使用了一些网站的截图，如果涉及侵权，请告诉我删一下谢谢~</blockquote> <div style="margin-top:30px;"><div class="el-row" style="margin-left:-10px;margin-right:-10px;"><div class="el-col el-col-24 el-col-sm-0 el-col-md-2 el-col-lg-4" style="padding-left:10px;padding-right:10px;display:block;"><div style="width:1px;height:1px;"></div></div> <div class="el-col el-col-24 el-col-sm-24 el-col-md-18 el-col-lg-16" style="padding-left:10px;padding-right:10px;"><div class="el-card box-card is-always-shadow"><div class="el-card__header"><div class="clearfix"><span>温馨提示喵</span></div></div><div class="el-card__body"> <div class="el-row" style="margin-left:-10px;margin-right:-10px;"><div class="el-col el-col-24 el-col-xs-24 el-col-sm-12" style="padding-left:10px;padding-right:10px;"><div class="el-image"><div class="image-slot"><img src="https://github-imglib-1255459943.cos.ap-chengdu.myqcloud.com/assets/img/loading.gif" style="width:100%;"></div><!----></div></div> <div class="el-col el-col-24 el-col-xs-24 el-col-sm-12" style="padding-left:10px;padding-right:10px;"><div class="copyright-text"><div>本文版权归作者所有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。</div> <div>出处：被删的前端游乐场</div> <div>作者：<a href="https://github.com/godbasin" target="_blank">被删</a></div></div></div></div></div></div></div></div></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
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